How to calculate annual leave

Most wrong leave balances were wrong from the first pay run.

That's the part people don't tend to realise, because the maths itself isn't that hard. Most full-time employees get four weeks of annual leave a year, they accrue it over time, and it's paid at their base rate. But it’s unlikely you’ll spot a wrong accrual rate on the day it's set. You'll find it two years later, when someone resigns and the payout doesn't look quite right. That means every pay run before it was wrong the same way, and likely was for every employee set up like that.

So the error happens early, the discovery is late, and every pay run in between adds to the bill. If someone drops from full-time to three days a week and their accrual rate doesn't follow, that’s it. It's wrong from that afternoon and it stays wrong until you go looking.

The formulas are the easy part. I've put them below, but it's what happens after them that costs money.

How to calculate annual leave (quick answer)

The rule for everyone:

Annual leave = ordinary weekly hours × weeks of entitlement

Both numbers change depending on the person. Most people get four weeks, but shiftworkers who meet the NES definition get five, and plenty of awards and contracts are more generous than the minimum. So don’t guess this one.

A typical full-time employee: 38 hours, 4 weeks

38 × 4 = 152 hours a year

Accruing at 2.923 hours a week (152 ÷ 52)

A typical part-time employee: 20 hours, four weeks

20 × 4 = 80 hours a year

Accruing at 1.538 hours a week (80 ÷ 52)

Part-time is the same calculation, just with a smaller first number. That’s all "pro rata" means here.

Annual leave accrual rates by hours worked

I’ve put some rough entitlements for the schedules you'll see most often, so you can eyeball a balance without reaching for a calculator.

Note: I’ve assumed a four-week entitlement here. If you’re on five weeks, multiply the yearly figure by 1.25.

Those weekly figures are rounded slightly. The exact number is annual entitlement divided by 52, and that's what your payroll system should be holding. Rounding is fine when you're telling someone their balance over a coffee. It's not fine as a stored value, because a few thousandths of an hour each week turns into a real number over a few years and a few hundred employees.

Annual leave gets messy. Rippling keeps it clean.

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What counts as annual leave in Australia?

Annual leave is paid time off that full-time and part-time employees earn as they work. It’s an employee benefit, and it exists so people can stop working for a while without losing income.

Casuals don't accrue annual leave. They get casual loading instead, which is 25% under most modern awards. The idea behind this is it’s meant to make up for the entitlements they miss out on. Check the relevant award for the accurate rate, because it’s an award thing, not set by the NES.

The line people often blur is between annual leave and everything else. Sick and carer's leave, unpaid parental leave, and public holidays are separate entitlements with their own rules, and none of them come out of an annual leave balance. Someone taking a holiday, or time off booked in advance, is on annual leave. Anything else isn't, no matter how the request came in.

How much annual leave do employees get?

Under the National Employment Standards (NES), employees (except casuals) get four weeks of paid annual leave a year. It's a minimum though, so awards, agreements and contracts can go above it, and plenty do.

Typically, nobody hands it over as a lump sum on day one. It builds up from their first shift, based on ordinary hours, and overtime doesn't count towards it.

Shiftworkers who meet the NES definition get five weeks instead of four. Whether someone qualifies is set out in their award or enterprise agreement, so that's the document to check, not the Act.

Unused leave rolls over year to year unless an award or agreement says otherwise. Most don't say otherwise, which is how you end up with someone sitting on 300 hours and a finance team asking questions.

How do you calculate annual leave for a full-time employee?

A full-time employee working 38 ordinary hours a week usually gets four weeks a year:

4 weeks × 38 hours = 152 hours per year

But they don’t get all 152 hours at once. They accrue it as they work.

152 ÷ 52 = 2.923 hours per week

So an employee who's been with you 26 weeks has accrued:

2.923 × 26 = 76 hours

How do you calculate annual leave for a part-time employee?

Part-time employees have the same entitlement, just scaled to their hours. That's what pro rata means.

4 weeks x ordinary weekly hours = hours per year

For someone working 25 hours a week:

4 x 25 = 100 hours per year

Same as full-timers, they earn it week by week rather than getting it upfront.

100 ÷ 52 = 1.923 hours per week

So after 30 weeks:

1.923 x 30 = 57.69 hours.

Where the formula stops working

The formulas above should get you the right number, but there’s a few situations where things still might go wrong.

Hours change mid-year

If an employee drops from 38 hours to 22, their accrual rate changes from that date forward, but the leave they already accrued at the full-time rate stays exactly where it is.

This is the one I'd check first in any balance that looks wrong, because in my experience it usually fails in the direction that costs you. Nobody updates the rate. The roster changes, the leave record doesn't, and the employee keeps banking hours as though they're still full-time. Then that balance gets paid out at whatever their base rate is on the day they leave. You're carrying hours they didn't earn, at a price you won't know until they resign.

Leave loading isn't universal, and it doesn't behave the way the award says on termination

Plenty of modern awards require 17.5% loading on top of base pay during annual leave. But many don't either. Some want the higher of the loading or the shift and weekend penalties the employee would have picked up had they worked. Pay a flat 17.5% across a mixed workforce because that's what the payroll template does, and some of those people are getting the wrong amount.

The part I'd flag hardest is what happens when they leave. Under section 90(2) of the Fair Work Act, unused annual leave gets paid out at whatever the employee would have been paid had they taken it. So if loading would have applied while they were on leave, it applies to the payout too. And per the Fair Work Ombudsman, that holds even when the award, enterprise agreement or contract says loading isn't payable on termination. The Act wins.

This one catches good payroll teams, because following the award text is normally the right instinct. But here it isn't. If that's what your payroll does, it's underpaying, and it's underpaying every departing employee the same way.

Balances live in two places

This is the failure I'd push hardest on, because it's the one that hides. Before moving to Rippling, Sitemate, a Sydney industrial software company, ran leave like this: an employee emailed their manager, the manager emailed accounting, and accounting keyed the request into Xero. There were three handoffs with no system of record, so the balance was only ever as accurate as the last email someone remembered to forward.

I've seen that setup in a lot of small businesses, and it works well enough that nobody questions it. The problem is there's no way to find out you're wrong. A missed email doesn't throw an error. It just leaves the balance slightly too high, for years, until someone resigns and you pay out leave they never accrued. Or slightly too low, and you don't pay out leave they did.

Sitemate now saves more than 100 hours a year on payroll, mostly by taking the humans out of the middle of it.

Excessive leave has a trigger, and a process

Once an employee accumulates more than eight weeks of accrued leave, most awards let you direct them to take some. For shiftworkers on five weeks a year, the threshold is 10 weeks. You have to genuinely try to reach an agreement first, then give written notice. And the notice period and minimum leave you can direct are set by the award.

My read is that most employers find this rule far too late, once someone's sitting on 12 weeks and the number on the balance sheet has got ugly. So I’d recommend checking quarterly to see who's above six weeks and climbing, rather than waiting for the threshold to do the work for you.

Annual leave rules worth knowing

Here’s some of the major rules you need to follow when managing annual leave:

Taking leave

• Employees can only take what they've accrued, unless you agree to leave in advance. Some awards and agreements allow that where you agree in writing, and the agreement has to be kept with the employee's records.

• Leave in advance has a tail. If someone leaves before they've accrued it back, some awards and agreements let you deduct what's outstanding from final pay. The keyword here is some. Check before you assume you'll get it back, because the deduction has to be authorised by the instrument, and for an employee under 18 a parent or guardian has to agree to it in writing as well.

• You can't unreasonably refuse leave, and you can't force someone to take it without a basis in their award or agreement.

Paying leave

• Leave is paid at the base rate for ordinary hours. That excludes overtime, bonuses, and commissions. It's also the rate at the time the leave is taken, not the rate when it accrued.

• Loading sits on top where the award requires it, usually at 17.5%, sometimes the higher of the loading or the penalties the employee would have earned. It's an award entitlement, not an NES one, so award-free employees generally don't get it.

Ending employment

• Accrued leave is paid out at what the employee would have been paid had they taken it. That's the section 90(2) test, and it's a broader than the base rate.

• Loading is included in that payout even if the award says it isn't. This one costs people money.

• Sick and carer's leave isn't paid out. Annual leave is. They accrue in similar ways and then part company at the exit interview.

Records

• Balances carry over year to year unless the award or contract sets different rules.

• Records have to be accurate, and "we didn't realise" isn't a defence. Underpay someone because your balance was wrong and it can count as wage theft regardless of intent.

Calculating annual leave manually? That’s so last financial year.

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Why correct annual leave calculations matter for compliance

Annual leave is an NES entitlement. Get it wrong and you're looking at Fair Work claims, backpay orders, and penalties, and the exposure builds because leave errors are almost never one-offs. If your accrual rule is wrong for one part-time employee, it's wrong for every part-time employee on that setup, for as long as it's been running. The Fair Work Ombudsman's annual leave guidance has the detail.

That's the thing I'd want you to take from this. A leave error isn't one person, it's a rule doing exactly what it was set up to do, and it’s what makes them hard to catch. Nobody's reading 200 leave records to see whether the accrual rates still match the rosters. It's a good question to ask, it's just not a good use of an afternoon, so it doesn’t get asked. Asking Rippling AI which part-timers have had hours change this quarter takes about as long as reading this sentence, and every name in the answer links back to the record it came from, so you can check it rather than trust it.

It’s worth doing before someone else does it for you. People compare payslips, and they'll talk to each other about a balance that looks wrong long before they talk to you.

Calculate, record, and pay annual leave with Rippling

Most leave problems are really caused by data. The balance is in one system, the hours are in another, payroll is in a third, and every gap between them is somewhere a number can drift. Rippling is built on a single data model, so an employee's hours, employment type, leave balance, and pay all read from the same record instead of being synced between systems. Change someone's hours and the accrual rate updates from the same source payroll pays from. There's no reconciliation step because there aren't two copies to reconcile.

What that looks like day-to-day:

• Leave accruals tracked in real time against each employee's ordinary hours and employment type.

• Employee self-service, so people can check their own balance instead of asking you on Slack. Or ask Rippling AI directly, which reads from the same record payroll pays from and only shows them what their permissions allow.

• Approved leave flows into the pay run, so leave payments land in the right cycle without anyone rekeying anything.

• Termination payouts calculated from the same balance you've been looking at all along.

Leave is just one piece of it. Rippling runs HR, payroll, and IT on that same platform, which is why the numbers agree with each other, and why the AI is worth anything. AI sitting on top of four disconnected systems is just a faster way to get an inconsistent answer.

Sydney pet food company Lyka recorded a 42% reduction in data quality issues after moving to Rippling, measured through internal audits of payroll corrections and employee record discrepancies before and after implementation.

Annual leave calculation FAQs